BG = Barry Garcia <[log in to unmask]>:
AJ = Andreas <[log in to unmask]>
JW = James Worlton

BG> There are the occasional 10 year 20 degree freezes

AJ> Is that minus twenty degree Celsius, or something else?

JW> That would be degrees Farenheit. 20 F = -7 C
JW> Those of us in the US who are not scientifically oriented still use the
JW> Farenheit scale.

Yup, but even for me, who has lived in the US all his life and thinks in
the Fahrenheit scale, Barry's term "twenty-degree freeze" was ambiguous.
Maybe it's a common set phras , but I'd not heard it before, so I was
thinking it maybe meant twenty degrees (F) below freezing (12F = -11C).